An earlier draft of the script was about giant killer leeches. This was later changed to zombies when Fred Olen Ray realized that leech costumes would be too expensive for the film's modest budget.
The original title for this movie was "It Fell from the Sky."
The bulk of this film was shot over the period of eight weekends.
The opening scene with the reporter was added to the movie at the last minute in order to pad the film's running time to a reasonable feature length.